// JavaScript Document

function doCalc()
{
price=document.getElementById("txt_price").value;
if (isNaN(price))
{
document.getElementById("error").style.display = "block";
document.getElementById("error").innerHTML = "<em>Please enter a valid gas price.</em>";
return;
}
else {
document.getElementById("error").style.display = "none";
}
//SAVINGS VALUE HERE
volume=32;
savings=0.20;
//CALCULATIONS
var result = (price*volume*10*savings);
document.getElementById("output").innerHTML= "$" + result.toFixed(2);
}